package tools

import "github.com/modelcontextprotocol/go-sdk/mcp"

// NewServer builds an MCP server with the full Verae timestamping tool set.
func NewServer(d *Deps) *mcp.Server {
	s := mcp.NewServer(&mcp.Implementation{
		Name:    "verae-timestamping",
		Version: "0.1.0",
	}, &mcp.ServerOptions{
		Instructions: instructions,
	})
	Register(s, d)
	return s
}

// Register adds welcome, stamp, stamp_batch, verify, hash_report, signup, login, session, create_user.
func Register(s *mcp.Server, d *Deps) {
	if d == nil {
		d = &Deps{}
	}
	mcp.AddTool(s, &mcp.Tool{
		Name: "welcome",
		Description: "Show the Verae welcome and onboarding text: what timestamping is, what this MCP does, " +
			"and how to signup or login. Call this when a user connects without an account or asks what Verae is.",
	}, d.welcome)
	mcp.AddTool(s, &mcp.Tool{
		Name: "stamp",
		Description: "Commit a SHA-256. scope=local is the leaf file ledger. scope=global posts the digest to api.veraetime.net and reuses the first CID unless restamp is true. " +
			"Optional metadata is sent as a verae-meta-git/1 history; blank values do not delete fields. " +
			"Optional receipt_format: omit=text; receipt|PDF-Receipt=PDF; JSON-Receipt=JSON; MD|MD-Receipt; CSV|CSV-Receipt; TSV|TSV-Receipt. " +
			"Always returns receipts[]; also returns artifacts[] in the chosen format (stdio writes ~/.verae/receipts; public MCP returns content only).",
	}, d.stamp)
	mcp.AddTool(s, &mcp.Tool{
		Name:        "stamp_batch",
		Description: "Commit up to 500 SHA-256 digests at once. scope=global (default) needs your Verae API key and charges each new digest to your account (your own repeats are free); returns one receipt entry per digest, in order, with the credits charged and your balance.",
	}, d.stampBatch)
	mcp.AddTool(s, &mcp.Tool{
		Name: "verify",
		Description: "Check a receipt. want_scope=global asks api.veraetime.net (central source of truth). " +
			"Pass receipt_id, or supply receipt / receipt_path with receipt_format (text|JSON-Receipt|MD|CSV|TSV|PDF-Receipt) to extract the id. " +
			"On success, re-emits an artifact in the requested format.",
	}, d.verify)
	mcp.AddTool(s, &mcp.Tool{
		Name:        "hash_report",
		Description: "JSON-array history of receipts for one SHA-256 (Carfax).",
	}, d.hashReport)
	mcp.AddTool(s, &mcp.Tool{
		Name: "signup",
		Description: "Self-serve create a VeraeTime user (POST /auth/signup, role=user), then return access_token. " +
			"Username must be an email address (a welcome email is sent to that address). " +
			"No Authorization required. Write access_token to your MCP bearer file (or Authorization header) before stamp. " +
			"On stdio/local transport the token is also stored on this host.",
	}, d.signup)
	mcp.AddTool(s, &mcp.Tool{
		Name: "login",
		Description: "Log in to api.veraetime.net and return access_token. Username is the account email address. " +
			"On the public HTTP server the host credential is never replaced — only the tool result carries the token. " +
			"On stdio/local transport the token is also stored on this host (auth.properties).",
	}, d.login)
	mcp.AddTool(s, &mcp.Tool{
		Name:        "session",
		Description: "Validate the caller's VeraeTime JWT (Authorization: Bearer). Returns valid, username, role, and expires_at.",
	}, d.session)
	mcp.AddTool(s, &mcp.Tool{
		Name: "create_user",
		Description: "Admin create a VeraeTime user (POST /auth/users / Swagger Auth/createUser). " +
			"Username must be an email address (a Welcome to Verae email is sent). " +
			"Requires Authorization: Bearer of an admin. Used by operators and edge provision; " +
			"self-serve MCP clients should use signup.",
	}, d.createUser)
}